Add availaibility->availability (#1988)

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 0727c03..f4a105a 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -3483,6 +3483,7 @@
 availablity->availability
 availabyl->available
 availaiable->available
+availaibility->availability
 availaible->available
 availailability->availability
 availaility->availability